Sulfur is the fourteenth most abundant element in the Earth's crust. Sulfur isconsistently exchanged between the lithosphere, biopsphere, hydrosphere, andatmosphere. Sulfur in the atmosphere, in both gaseous and aerosol form, hasimapcts on regional and global chemistry, climate change, and the health ofliving organisms. Sulfur gases can also affect stratospheric chemistry.Carbonyl sulfide (OCS) and volcanic emissions may affect Earth's radiationbudget and climate as well as ozone destriction in the stratosphere.